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Three ideas (one you might not like, but if it works...):
Make sure he goes to the bathroom just before bed. Did wonders for our daughter.
Try some higher-absorbency pullups. Since he's almost 6, maybe move to GoodNights or something similar for older kids with bladder control issues. You might just be overloading the capacity of the diaper.
If you can ...

Some useful steps we used:
Try to move her liquid intake earlier in the day - sounds like you have been trying to do this, but it is what will really make a difference at this age
Make sure she visits the toilet just before bed - possibly encourage her to do this both before and after cleaning her teeth. Sometimes trying twice can help a child relatively ...

What about an oatmeal or other type of cereal in place of half of his usual milk? I don't see how you're going to eliminate soakage if he's so hungry before bedtime.
Try something that's filling, and cut the milk he receives in half?

This sounds like a difficult position to be in, but if the wet diaper isn't uncomfortable enough to wake him up, I would let him sleep. If you end up doing this several nights in a row, just make sure to check carefully for developing diaper rash or infections.
In the mean time, have you tried overnight or extra-absorbant diapers?

It's totally normal
Don't worry. Many children do experience setbacks like this. It's totally normal, only to be expected, and almost certainly temporary.
Keep calm, don't give a payoff
My eldest had this problem when he was 4. Here's what we did. If he wee'd in the night, we just kept everything super calm and changed everything, all the sheets and ...

Aside from some physiological or psychological factor another thing to consider is that during potty training you probably (if you were like us) followed a very specific bedtime routine. No water after x:00pm, pee before bedtime etc.
After our now 5 year old was all trained, we started to get a little lax on the routine. Sure you can have a drink, I will ...

Bed wetting, even at 7 years old, is common. About 1 in 40 children at that age wet the bed. Children usually grow out of it.
Stop waking her in the night. That doesn't help.
Make sure she is drinking plenty in the day time. This will help her train her bladder. She should reduce the amount she drinks in the evenings. Make going to the loo last thing ...

Frankly you will be told by any professional that you should not. This is what we were told with our first 3. Over the years what we have learnt is this: limit the consumption of liquids, especially water at 6pm. By 7pm and before bed, he should be taken for a pee - this should be a ritual from now on.
Thus you would have to build a motivational ...

It is certainly not a willful behaviour at this age, especially in the middle of the night. So it won't help to explain your expectations, it will just frustrate her more.
Was there any substantial change lately in the child's life? E.g. birth of younger sibling, starting kindergarten / preschool, problems in kindergarten / preschool, mom / dad starting / ...

He has been checked to see if there is anything physically causing the problem.
By whom? It sounds like it's past time to see a specialist about this, or a different one if you've already seen one.
For our daughter (7 right now), we have to use a multi-pronged approach:
Controlling liquid intake: No more than a sip or two of water after dinner. ...

My younger son struggled with night-time wetting until he was 14. In his younger years, we weren't too worried about it; I had several friends who assured me he would grow out of it. He was a VERY heavy sleeper, and even if I went in to wake him for a bathroom break in the middle of the night, he didn't really wake up. I actually stopped doing that after I ...

This is very common.
Make sure drinks are done an hour before bedtime and the toilet gets used every night, last thing.
Get a waterproof mattress pad and extra sheets, and change them when you need to.
It's important that you don't dump a bucket of shame on the kid. She's not doing it on purpose.
Try to laugh. This too shall pass.

We were having a similar problem and a combination of three things helped:
We switched back to brand-name diapers. We'd bought a box of generic ones from Costco or Sam's Club that worked fine all day but leaked overnight. Pampers helped.
We ensured the diaper was on perfectly, specifically that nothing was folded under the elastic bands around the legs and ...

My wife is the school nurse at an outdoor school (sixth grade camp) and this problem is very common among the sixth graders (10-11 year olds) she sees. They've developed procedures so these kids can attend successfully without the other kids knowing.
As annoying as this is, it will pass. Adding shame, even unintentionally, will help nothing and hurt a lot.
...

Only anecdotal, but a counter-argument to those who say that by waking him you are encouraging him to be dependent on you to stay dry - we used to take my son to the toilet in the night until he was about 7 and stopped needing it of his own accord. The hormonal changes required to slow down urine production at night don't kick in very early in some children, ...

My boy was waking up wet a lot older than is typical, and here is what we did. We happened to have some plastic graduated beakers that held about 800 ml and were clearly marked to measure volume. I showed him how to read the volume on them and we kept them in the bathroom. I encouraged him during the day, when he was home and could go to the bathroom ...

Well, urine has 2 characteristics to consider:
Presence of bacteria
Acidity
For a long time the concept of urine being sterile in non-sick individuals has been well-known. Recent research indicates that that may not be the case. However, if you're sick, you won't make yourself more sick by being exposed to yourself. So, if things are cleaned up in a ...

I have four kids. My youngest two (twin boys) are four, my daughter is six and my son is seven. Of the four, my youngest son (youngest by two minutes) has absolutely no problems staying dry through the night. I honestly don't remember the last time he had an accident. His twin brother is the exact opposite and always needs diapers/pull-ups at night. My ...

The other answers address the diaper-change well. Let me add:
Make sure to reduce the child's fluid intake in the time prior to bedtime. Don't let him drink too much in the last 1 or even 2 hours, obviously except the good-night bottle if you have one.

Why are the sheets wet? Are you not using a diaper?
Assuming you are using a diaper and the sheets are not wet, I would suggest you leave the wet diaper on. Our nightly routine with all 5 of our kids included changing the diaper right before bed time (unless it was still crunchy) and leaving it on them until the morning. Yes, it may be wet, but the diapers ...

I sleep in the same room as my 4 year old son while my wife sleeps with our 6 month old. One pattern that I have noticed is that he will start to cry out in his sleep and get very restless when he needs to go pee. I will then wake him up and ask him if he needs to go pee. It can be hard to get him awake enough to answer the question and sometimes he gets ...

At the request of the OP I have added this as an answer and deleted the comment. I would like offer an alternative to the maxi pad suggestion: try wool long underwear. I have a heavy wetter (not toilet trained yet, but still...) and I had the same laundry issue as you. And it isn't easy changing crib sheets either, so I feel your pain. Anyway, you can find ...

At 3yo she may not be ready to be 100% toilet trained. My daughter took a lot longer than that before she could reliably go through the night without wetting herself. The body can just take a while to develop the necessary feedback loop.
We tried all the things Rory mentioned, including midnight toilet runs. Didn't help. She was ready when she was ready.
...

I would recommend not stressing out about bedwetting in general because that might cause anxiety for your daughter. "Serious long-term emotional problems can result from angry scolding or punitive attitudes towards accidents or resistance" (The Baby Book, pg. 585). Prep your mind mentally in advance because accidents WILL happen. It's part of them figuring ...

From the same article posted in the question, the symptoms section identifies when to consult a doctor:
When to see a doctor
Most children outgrow bed-wetting on their own — but some need a little help. In other cases, bed-wetting may be a sign of an underlying condition that needs medical attention.
Consult your child's doctor if:
Your ...

To @Valkyrie's excellent suggestions, I would add that mastering toileting is your child's "job," and at this age you might consider making him part of the clean-up process. If the sheets are wet in the morning, he has to help pull them, he helps wash them, he helps put them back on the bed. By making him responsible for these daytime activities, he may ...

When our toddler was going through a bedwetting phase, we just started waking her up when we went to bed later, and taking her to the loo. Actually, waking up is too strong a word, as she was normally still half asleep. It stopped her wetting the bed, and a couple of weeks later we stopped waking her up. If the bed wetting started again, we would start ...

If your child is often wetting the bed at night, he is likely not ready to be sleeping without a diaper or pull-ups. From PubMed Health (US National Library of Medicine):
Nighttime bladder and bowel control develops somewhat more slowly. So,
even once your child is dry during the daytime, it can take a while
before they notice in their sleep that ...